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Question 5.
A gardener requires fertiliser to have a minimum of 80 units of nitrogen, 15 units of potassium and 10 units of iron. Two fertiliser mixes are available.

Brand X contains 20, 2 and 1 units of the minerals, while.
Brand Y contains 4, 1, 2 units of the minerals,respectively.
Brand X costs ₤ 18 per kg while brand Y cost ₤ 6 per kg.


1. Write down the inequality constraints and equation fo the cost function.
2. Graph the inequality constraints. Hence determine the number of kg of each brand which provide the minimum mineral requirements at minimum cost.
3. Confirm your answer in 2 algebraically.

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关键词：Economic econom Econo Econ mic

你没500金币，怎么酬谢人啊，这道题还不算太难，再仔细想一些，加油。。。

我说的是RMB！